Jason O'Mara: Jason O'Mara. Actor: The Man in the High Castle. Jason O'Mara was born and raised in Dublin, Ireland. Soon after graduating from Trinity College Dublin with a BA in Drama and Theatre he moved to London, England, to further pursue his acting career. Time spent in British repertory theater led to leading roles in acclaimed productions at some of Britain and Ireland's great theaters, including The Royal Shakespeare Company, The...
